package com.gh.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.gh.reggie.common.BaseContext;
import com.gh.reggie.common.CustomException;
import com.gh.reggie.entity.*;
import com.gh.reggie.mapper.OrdersMapper;
import com.gh.reggie.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;


@Service
public class OrdersServiceImpl extends ServiceImpl<OrdersMapper, Orders> implements OrdersService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;
    @Autowired
    private AddressBookService addressBookService;
    @Autowired
    private OrderDetailService orderDetailService;
    /**
     * 用户下单
     * @param orders
     */
    @Override
    public void submit(Orders orders) {

        //获取当前用户ID
        Long userId = BaseContext.getCurrentId();
        //查询当前用户购物车数据
        //select * from shopping where userId = ？
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,userId);
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(queryWrapper);

        if(shoppingCarts ==null || shoppingCarts.size() == 0){
            throw new CustomException("购物车为空，下单无效！");
        }

        //查用户信息
        User user = userService.getById(userId);

        //查用户地址信息
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        if(addressBook == null){
            throw new CustomException("地址信息为空，请填写收货地址！");
        }

        //订单号
        long orderId = IdWorker.getId();
        //AtomicInteger(原子计算方法。
        // 用于多线程下线程安全的数据读写操作，避免使用锁同步，底层采用CAS实现，内部的存储值使用volatile修饰，因此多线程之间是修改可见的)
        AtomicInteger amount = new AtomicInteger(0);
        //遍历购物车数据算金额
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item)->{
            OrderDetail orderDetail = new OrderDetail();

            orderDetail.setOrderId(orderId);
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            // 设置用户名
            orderDetail.setName(user.getName());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setNumber(item.getNumber());
            orderDetail.setAmount(item.getAmount());
            // 总金额 = 单价 * 份数
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        //向订单表插入数据,单条数据
        orders.setNumber(String.valueOf(orderId));
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额，需要 遍历购物车，计算相关金额来得到
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));

        this.save(orders);
        //向明细表插入数据多条数据
        orderDetailService.saveBatch(orderDetails);

        //清空购物车
        shoppingCartService.remove(queryWrapper);

    }
}
